高含气率条件下V锥流量计的压力恢复特性

The gas-liquid distribution in the V-Cone flowmeter and the effect of the distribution on the downstream pressure recovery of V-Cone under high gas volume fraction were experimentally investigated. The effects of inlet flow patterns and equivalent diameter ratio of the V-Cone flowmeter on the gas-liquid distribution were explored. The pressure recovery length of the V-Cone flowmeter at different equivalent diameter ratio was obtained. The results show that the flow pattern may be changed when flowing through the V-Cone, and the diameter ratio significantly affects the downstream flow pattern of the V-Cone. The pressure distribution along the flow direction is closely related to the flow pattern. It is found that the pressure recovery length of the V-Cone flowmeter for gas-liquid flow is shorter than that for single-phase fluid. The pressure recovery length of the V-Cone flowmeter with a diameter ratio of 0.45 at high gas volume fraction is less than 6D, and the pressure can be recovered at the position of 3D downstream of V-Cone under certain conditions. For the V-Cone flowmeters with the diameter ratios of 0.55, 0.65 and 0.75, the pressure can be recovered at the position of 3D downstream of V-Cone. This study may provide a guide to the development of a method for measuring gas and liquid flow rates online by a V-Cone throttle device.